Here's where I'm at (update 2/26/12 - or 26/02/12 for those outside the US):
SEGA Master System:
Sonic The hedgehog
Sonic The hedgehog 2
Sonic Chaos
Sonic Blast
SCUMMVM:
Spy Fox In: Dry Cereal
Field Trip: Luggage Transport game
SEGA Genesis:
Jester's Challange (Sonic Hack)
Psy 30 Day Challange (Sonic Hack)
Sonic 3D Blast: No Flickies Hack (With Super Sonic)
Robotnik's Revenge (Sonic Hack)
Sonic Boom (Sonic Hack)
Sonic: Bro Trouble (Sonic Hack)
Game Boy:
Kirby's Dream Land (And Extra Mode!)
Kirby's Dream Land 2 (No 100%)
Super Mario Land
Super Mario Land 2
MAME:
SegaSonic The hedgehog
Super Nintendo:
Pilotwings
Kirby Super Star
Super Mario All-Stars: Mario 1
Super Mario All-Stars: Mario The Lost Levels (Mario 2 JAP)
Donkey Kong Country (Not 101% - Never been able to do it.)
Donkey Kong Country 2 (Not 102% - Never been able to do it.)
Donkey Kong Country 3 (103%!)
Super Mario World (There's one exit I missed that I can't find! It must be a ghost house or something.)
Sega CD:
Sonic CD
Playstation:
Croc: Legend Of The Gobbos
Neo Geo Pocket:
Sonic Pocket Adventure
Game Boy Advance:
Wario Land 4
Kirby: Nightmare In Dream Land
Kirby & The Amazing Mirror
Warioware Inc. (Not 100%)
Homebrew:
Bubbman2
Will update this as I go.